EP 0880858 A4 20001227 - FACSIMILE-BASED VIDEO COMPRESSION METHOD AND SYSTEM
Title (en)
FACSIMILE-BASED VIDEO COMPRESSION METHOD AND SYSTEM
Title (de)
VERFAHREN UND SYSTEM ZUR FAKSIMILEBASIERTEN VIDEOKOMPRESSION
Title (fr)
PROCEDE ET SYSTEME DE COMPRESSION D'IMAGES VIDEO BASES SUR LA TELECOPIE
Publication
Application
Priority
- US 9701566 W 19970213
- US 60604396 A 19960216
Abstract (en)
[origin: WO9730550A1] A method and system (10) for compressing and decompressing video image data in real time employs thresholding and facsimile-based encoding to eliminate the need for computationally intense two-dimensional transform-based compression techniques. The method operates first by forming a difference frame which contains only information pertaining to the difference between a current video image frame and a computed approximation of the video image frame. The difference frame is fed to a thresholder (32) which categorizes each pixel in the frame as being either in a first set having intensities above or at a preset threshold, or a second set having intensities below a preset threshold. A facsimile-based compression algorithm in an encoder (44) is then employed to encode the first set of above or at threshold pixel locations. To compress the intensity data for each above or at threshold pixel, a quantizer (40) and a lossless encoder (50) are preferably employed.
IPC 1-7
IPC 8 full level
G06T 9/00 (2006.01); H04N 7/32 (2006.01); H04N 7/36 (2006.01); H04N 7/46 (2006.01)
CPC (source: EP US)
H04N 19/00 (2013.01 - EP US); H04N 19/503 (2014.11 - EP US); H04N 19/507 (2014.11 - EP US); H04N 19/587 (2014.11 - EP US); H04N 19/59 (2014.11 - EP US); H04N 19/93 (2014.11 - EP US)
Citation (search report)
- [X] US 4688108 A 19870818 - COTTON ROBERT V [US], et al
- [E] US 5917952 A 19990629 - NOH JAE [US]
- [A] EP 0370322 A2 19900530 - SCHLUMBERGER TECHNOLOGIES INC [US]
- [PA] EP 0755155 A2 19970122 - HEWLETT PACKARD CO [US]
- [A] US 5008747 A 19910416 - CARR MICHAEL D [GB], et al
- [X] ANONYMOUS: "High Performance Exact Gray Scale Compression Technique. February 1982.", IBM TECHNICAL DISCLOSURE BULLETIN, vol. 24, no. 9, 1 February 1982 (1982-02-01), New York, US, pages 4513 - 4516, XP002150853
- [X] SAUER K ET AL: "BAYESIAN BLOCK-WISE SEGMENTATION OF INTERFRAME DIFFERENCES IN VIDEO SEQUENCES*", CVGIP GRAPHICAL MODELS AND IMAGE PROCESSING,US,ACADEMIC PRESS, DULUTH, MA, vol. 55, no. 2, 1 March 1993 (1993-03-01), pages 129 - 139, XP000364280, ISSN: 1077-3169
- [A] TUBARO S. ET AL: "Motion field estimators and their application to image interpolation", 1993, KLUWER ACADEMIC, USA, NORWELL, MASSACHUSETTS, XP002150854
- See references of WO 9730550A1
Designated contracting state (EPC)
AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
WO 9730550 A1 19970821; AU 1851097 A 19970902; CA 2244809 A1 19970821; CA 2244809 C 20050621; EP 0880858 A1 19981202; EP 0880858 A4 20001227; JP 2000504911 A 20000418; US 5740278 A 19980414
DOCDB simple family (application)
US 9701566 W 19970213; AU 1851097 A 19970213; CA 2244809 A 19970213; EP 97904138 A 19970213; JP 52936897 A 19970213; US 60604396 A 19960216